Vibrational dynamics of isolated hydrogen in germanium

C. Parks Cheney, M. Budde, G. Lüpke, L. C. Feldman, N. H. Tolk

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Abstract

Absorption line shapes associated with the stretch mode of bond-center hydrogen (HBC(+)) at 1794 cm-1 and the twofold degenerate mode of hydrogen near the tetrahedral site (H(-)) at 745 cm-1 in germanium are measured with infrared-absorption spectroscopy. The HBC(+) line shape measured at 10 K for the case of low hydrogen concentrations gives a lifetime between 15 and 23 ps. Similar in magnitude to the 7.8±0.2 ps observed for the same defect in silicon [M. Budde et al, Phys. Rev. Lett. 85, 1452 (2000)], this observation indicates that the lifetime of the bond-centered mode is largely insensitive to the phonon frequency distributions of the host material. Pure dephasing dynamics of hydrogen in germanium are studied by measuring the shape of the 1794- and 745-cm-1 lines as a function of temperature. These measurements are analyzed using a recently formulated exchange model for vibrational dephasing. The temperature dependence of the 1794-cm-1 line shape is attributed to thermal fluctuations in the occupation number of a pseudolocalized mode at 75±2 cm-1.

Original languageEnglish
Article number035214
Pages (from-to)352141-352149
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number3
Publication statusPublished - Jan 15 2002

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Cheney, C. P., Budde, M., Lüpke, G., Feldman, L. C., & Tolk, N. H. (2002). Vibrational dynamics of isolated hydrogen in germanium. Physical Review B - Condensed Matter and Materials Physics, 65(3), 352141-352149. [035214].